JIUNHNDINT, An error during $ZINTERRUPT processing was not handled: eeee;

Run Time Error: When returning from code invoked by MUPIP INTRPT (clearing $ZININTERRPT), GT.M implicitly clears any error(s) detected while 1=$ZININTERRUPT, sends this error notification to the operator log and continues processing; eeee is the mnemonic for the unhandled error.

Action: Fix $ZINTERRUPT handler to either not generate the error or to correctly handle it before returning to interrupted code

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