I found 1.3 DOS undocumented (not even Guru book mentions it) bug/feature that causes access fault when filesystem handler starts and handler was expecting documented ACTION_STARTUP packet contents.
For some reason 1.3 autoboot startup packet has only single valid field (dp_Arg2 is valid, dp_Arg1=garbage, dp_Arg3=NULL). Only manual mounting creates fully valid packet.
Update coming soon.
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