It does (again using the debug project with a small timer update value), although now I feel I missed something obvious everyone knows :). Here it is anyway:
processFifo() method in
requestsType.setUnchecked (numRequests, type) in its while loop with
numRequests = 256, it fires the
jassert (isPositiveAndBelow (indexToChange, values.size())); in
juce_Array.h (l.524). Juce version 5.4.1.