Fix clobering of operand by error handler in assignment to string offset

In some cases new code requires two reallocations insead of one.

Fixes oss-fuzz #31716, #36196, #39739 and #

Fix clobering of operand by error handler in assignment to string offset

In some cases new code requires two reallocations insead of one.

Fixes oss-fuzz #31716, #36196, #39739 and #40002

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