However, there could be the case where some unused blocks may lead to other
unused blocks. For example, Block 1 and Block 3 may be unused blocks, and Block
3 leads to Block 1. After Block 1 is deleted, the optimizer will attempt to
delete Block 3 as well. At this time, it may run into a segmentation fault as
Block 3 still contains some references to Block 1.
This problem has been discovered in the work of PR22315.
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