Trail renderer doesnt appear to receive the correct values from a Light Probe Proxy Volume (See Image).

Repro Steps:

1) Open attached project and scene "VolumeTest"
2) Notice the positions along X axis of different coloured lights (for reference)
3) Enter play mode
4) Select "Cube" and move it down positive X until the trail renderer is yellow
5) Now move "Cube" down negative X until the trail renderer is red
6) Observe how trail renderer colour does not match light colour positions (and LPPV effect on cube) as it moves along negative X

Further:

7) Now move "Cube" down positive X until the trail renderer is yellow again.
8) Observe how the distance needed from light position is larger than it was in step 5/6 (if you were to repeat steps 5-8 the distance would get greater each time)

NOTE: This issue is amplified by object scale. Bigger objects/distances results in a larger discrepency between cube colour and trail colour