[Bug] mass univariate, multiple events with 'char' errors

[behinger]

Description

this is relevant only in combination with UnfoldSims 'char' sequence

Package Version

0.8.3

Julia Version

1.11

Reproduction steps

_evts = deepcopy(evts)
	_evts.event = string.(_evts.event)
	
m_ep = fit(UnfoldModel,["A"=>(@formula(0~1+condition),times),"B"=>(@formula(0~1+condition),times)],_evts,data_epoch)

Relevant log output

Operating System

No response