Snapshot is not stable, especially over time.. snapshot target boot images and snapshot packages are rebuilt daily. Even the next day, snapshot packages may no longer be compatible with the previous day's snapshot image. If you need/want to run a snapshot image and install packages at your leisure, you need to mirror the snapshot packages at the time you download the snapshot image. I hope all that is not too confusing 
Check out this post for how I've created my own point-in-time mirror of snapshot:
https://forum.openwrt.org/t/stable-openwrt-version-for-64-bit-arm-raspberry-pi4b/79062/6
I still keep an eye on the change logs, but now it's mostly for security announcements, bugs or features, rather than installation stability.
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