My guess is that this extra TS is breaking my luxletter TS overrides that I have in the jimb extension. Why is this loading so low even if I have a specific static include order?
That single ‘luxletter’ entry is an ‘Extension static’ auto-include: It reads files EXT:luxletter/ext_typoscript_setup.typoscript and EXT:luxletter/ext_typoscript_constants.typoscript if they exist.
Ok, I found it. The two files need to be at the root of the extension package folder. Then, the static include of the extension package itself needs to be at the top in order for this to override luxletter’s templates.