ESP plugins that use ESL files as masters are selectable in the initial plugin selection, but do not show up in the merging section

[Reshirou]

One sentence essentially sums it up.

You can select a mod that, say, adds cut content from a Creation Club mod back, but after pressing okay and waiting for the background loader, neither that mod nor the CC esl are there.

[foul-fortune-feline]

There's an access violation when merge plugins attempts to load esls if you look in the log. This is pretty massive as an issue because USSEP has esl masters now (survivalmode and curios) which makes merge plugins effectively unusable on a good third of the mods out there on AE