Looking at the backtrace from the bug report, it looks like the vector
could get reallocated when it changes capacity ...etc, which would
invalidate iterators.

Instead use a FIFO std::queue, since ideally the dirs should be searched in
the same order they're added to the pendingDirs container, and then
removed, and removing from the from of a vector is more costly than with a
queue (which uses a std::deque by default).

BUG: 448114
FIXED-IN: 22.04.3