Tried loading into my world with PAE2 v45g, but was met with an immediate crash.
crash-2021-07-27_14.15.24-server.txt
Last known version where issue do not exist is v45e

• Minecraft Version: 1.12.2
• AE2 Version: PAE2 v45g
• Omni Dev (94c01dd)

Same issue, looks to be a Fluid Storage Bus problem.

Here's a world load crash: http://paste.ubuntu.com/p/DzRHMzChV2/
And a crash when placing a fluid storage bus: http://paste.ubuntu.com/p/9tnGWdnrQH/

v45h should fix this. sorry.