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TMUXHS4212: tmuxhs4212irksr -sel pin ?

Part Number: TMUXHS4212

When customers use the chip tmuxhs4212irksr, they encounter the following problems:

When sel pin = L, port a to port B

When sel pin = h, port a to port c

However, when I cut the SEL pin from h to L, it doesn't work. It's still port a to port C.

Here is my schematic diagram. How can I solve this problem?