This anomaly applies to IC Rev. Engineering A, build codes SICA-BAA.
Always when starting a debug session.
If the debug probe writes the debug port CTRL/STAT.DBGPWRUPREQ and waits on CTRL/STAT.DBGPWRUPACK, it does not finish.
When enabling debug domain power, write CTRL/STAT.DBGPWRUPREQ and CTRL/STAT.SYSPWRUPREQ.