The Frame Projector leaves behind extra TileEntities (including its own):
https://www.youtube.com/watch?v=plXKHWrVPAo
https://www.youtube.com/watch?v=zitCpFpPQs8

Not all types of TileEntities are affected, for example EnderChests and Vanilla chests are immune.

I noticed this while building an AppliedEnergistics/EnderChest frame quarry similar to but larger than the construction in the second video linked above.
After a few hundred moves, the number of TileEntities was >100,000 and some game ticks were taking more than 2 seconds (seen with "/profile s" which measures lag spikes).

The /profile command comes from the mod "TickProfiler":
https://github.com/MinimallyCorrect/TickProfiler

I would greatly appreciate any help with this! :)