Since incompatibilities below 1.21.1 aren't being accepted by Sinytra's developers, I suppose this poses as more of a cautionary post for others planning to use this Fabric mod with Sinytra and Forge.

Sinytra is unable to load Fabric mod MineFortress. Versions attempted were those available for Minecraft 1.20.1.

Forge crashes at the 'Loading Bootstrap Resources' stage providing no actual Crash Report, only a latest.log.

• Log - attached for review on the off chance Sinytra developers wish to investigate further.

EDIT: A new log has been provided and erroneous details removed from this post. Sinytra Connector, Sinytra Connector Extras, Forgified Fabric API and MineFortress are now the only active mods in this log to make it faster and easier to read.