Hello, I'm the mod author of the Personal Transformer mod (https://mods.factorio.com/mod/PersonalTransformer2) and somebody reported an issue where technology from my mod could not be researched as a result of the restructuring of the research tree from your mod. The specific case they cited was that they started with accumulators known, but did not have the research complete. Not trying to pass the buck here, but it seems like it would make more sense to fix the compatibility issue here as it may crop up down the road for other mods.
Bug report in question: https://mods.factorio.com/mod/PersonalTransformer2/discussion/6751187e1be60f8c6351c6a2

I think in an effort to get the mod done as soon as possible I just hard coded accumulators to be unlocked from the start and hid the technology, but I can easily convert that into making all recipes unlocked from that tech available from the start programmatically. I'm on a bit of a break from modding right now because I overworked myself, but I'm feeling like getting back into the swing of things soon here and this is a very easy fix on my end. Thanks for the referral!

I've just released an update that should fix this issue and any other issue with "removed" technologies. Sorry it took so long!

Sweeeeet. Hope you didn't overwork yourself this time. ;)