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I tried to shrink my Windows Bootcamp partition using third-party software which led to my Macintosh HD partition missing from startup options. Unfortunately I don't have a recent backup for the whole drive to restore from. If I try to reinstall macOS from scratch it doesn't see the partition either.

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Disk utility sees it but it's greyed out and is being shown as Unmounted without the option to mount it back.

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Is there a way to fix this without wiping out the whole drive and reinstalling everything from scratch?

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The second image you posted shows a partition type of DE94BBA4-06D1-4D40-A16A-BFD50179D6AC. This is for a Windows Recovery Environment type partition.

From Windows, you can open a Command Prompt window as an Administrator. Next, you could enter the commands given below to change disk0s2 to an Hierarchical File System Plus (HFS+) type partition.

diskpart
select disk 0
select partition 2
set id=48465300-0000-11AA-AA11-00306543ECAC override
gpt attributes=0x0000000000000000
exit

Note: This answer assumes you are not using Core Storage.

A more comprehensive solution is given as the accepted answer to the question: OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF'. Despite the fact that your partition type is DE94BBA4-06D1-4D40-A16A-BFD50179D6AC and the linked question partition type is FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF, the accepted answer provides a solution that would work in your case.

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