This bug was encountered when using ghost groups, where the child entity has a dynamic buffer. In my case, the ghost groups and parent/child components are setup at runtime. The error shows in the console when the buffer exceeds a certain length (20 in my case). The error message is: "InvalidOperationException: writing snapshot dyanmicdata outside of memory history buffer memory boundary".

With the attached sample project, entering playmode is enough to see the error. I have tested this with netcode for entities versions 1.0.15 and 1.2.3.

Full error:
InvalidOperationException: writing snapshot dyanmicdata outside of memory history buffer memory boundary
Assembly_CSharp.Generated.TestBufferGhostComponentSerializer.CheckDynamicDataRange (System.Int32 dynamicSnapshotDataOffset, System.Int32 maskSize, System.Int32 len, System.Int32 dynamicDataSize, System.Int32 dynamicSnapshotMaxOffset) (at NetCodeSourceGenerator/Unity.NetCode.Generators.NetCodeSourceGenerator/Assembly-CSharp/TestBufferSerializer.cs:125)
Assembly_CSharp.Generated.TestBufferGhostComponentSerializer.SerializeBuffer (System.IntPtr stateData, System.IntPtr snapshotData, System.Int32 snapshotOffset, System.Int32 snapshotStride, System.Int32 maskOffsetInBits, System.IntPtr componentData, System.IntPtr componentDataLen, System.Int32 count, System.IntPtr baselines, Unity.Collections.DataStreamWriter& writer, Unity.Collections.StreamCompressionModel& compressionModel, System.IntPtr entityStartBit, System.IntPtr snapshotDynamicDataPtr, System.Int32& dynamicSnapshotDataOffset, System.IntPtr dynamicSizePerEntity, System.Int32 dynamicSnapshotMaxOffset) (at NetCodeSourceGenerator/Unity.NetCode.Generators.NetCodeSourceGenerator/Assembly-CSharp/TestBufferSerializer.cs:286)
(wrapper native-to-managed) Assembly_CSharp.Generated.TestBufferGhostComponentSerializer.SerializeBuffer(intptr,intptr,int,int,int,intptr,intptr,int,intptr,Unity.Collections.DataStreamWriter&,Unity.Collections.StreamCompressionModel&,intptr,intptr,int&,intptr,int)
Unity.NetCode.GhostChunkSerializer.SerializeEntities (Unity.Collections.DataStreamWriter& dataStream, System.Int32& skippedEntityCount, System.UInt32& anyChangeMask, System.Int32 ghostType, Unity.Entities.ArchetypeChunk chunk, System.Int32 startIndex, System.Int32 endIndex, System.Boolean useSingleBaseline, Unity.NetCode.GhostChunkSerializer+CurrentSnapshotState& currentSnapshot, System.Byte** baselinesPerEntity, System.Int32* sameBaselinePerEntity, System.Int32* dynamicDataLenPerEntity, System.Int32* entityStartBit) (at ./Library/PackageCache/com.unity.netcode@1.0.15/Runtime/Snapshot/GhostChunkSerializer.cs:657)
Unity.NetCode.GhostChunkSerializer.SerializeGroup (Unity.Collections.DataStreamWriter& dataStream, Unity.Collections.StreamCompressionModel& compressionModel, Unity.Entities.DynamicBuffer`1[Unity.NetCode.GhostGroup]& ghostGroup, System.Boolean useSingleBaseline) (at ./Library/PackageCache/com.unity.netcode@1.0.15/Runtime/Snapshot/GhostChunkSerializer.cs:1228)
Unity.NetCode.GhostChunkSerializer.SerializeEntities (Unity.Collections.DataStreamWriter& dataStream, System.Int32& skippedEntityCount, System.UInt32& anyChangeMask, System.Int32 ghostType, Unity.Entities.ArchetypeChunk chunk, System.Int32 startIndex, System.Int32 endIndex, System.Boolean useSingleBaseline, Unity.NetCode.GhostChunkSerializer+CurrentSnapshotState& currentSnapshot, System.Byte** baselinesPerEntity, System.Int32* sameBaselinePerEntity, System.Int32* dynamicDataLenPerEntity, System.Int32* entityStartBit) (at ./Library/PackageCache/com.unity.netcode@1.0.15/Runtime/Snapshot/GhostChunkSerializer.cs:1061)
Unity.NetCode.GhostChunkSerializer.SerializeChunk (Unity.NetCode.GhostSendSystem+PrioChunk& serialChunk, Unity.Collections.DataStreamWriter& dataStream, System.UInt32& updateLen, System.Boolean& didFillPacket) (at ./Library/PackageCache/com.unity.netcode@1.0.15/Runtime/Snapshot/GhostChunkSerializer.cs:1615)
Unity.NetCode.GhostSendSystem+SerializeJob.sendEntities (Unity.Networking.Transport.NetworkDriver+Concurrent& driver, Unity.Collections.DataStreamWriter& dataStream, Unity.Entities.DynamicComponentTypeHandle* ghostChunkComponentTypesPtr, System.Int32 ghostChunkComponentTypesLength) (at ./Library/PackageCache/com.unity.netcode@1.0.15/Runtime/Snapshot/GhostSendSystem.cs:1025)
Unity.NetCode.GhostSendSystem+SerializeJob.Execute (System.Int32 idx) (at ./Library/PackageCache/com.unity.netcode@1.0.15/Runtime/Snapshot/GhostSendSystem.cs:777)
Unity.Jobs.IJobParallelForDeferExtensions+JobParallelForDeferProducer`1[T].Execute (T& jobData, System.IntPtr additionalPtr, System.IntPtr bufferRangePatchData, Unity.Jobs.LowLevel.Unsafe.JobRanges& ranges, System.Int32 jobIndex) (at ./Library/PackageCache/com.unity.collections@2.1.4/Unity.Collections/Jobs/IJobParallelForDefer.cs:79)

Note: No test was carried out by CQA.