Hoppers breaking for no apparent reason?

Whenever someone puts something in a chest above a hopper, the hopper breaks. This applies to anything else that can hold items as far as I've tested (including a hopper on top causes the bottom one to break ) I haven't upgraded anything on my server in a few weeks so I have no idea what is happening.
Paper version 1.21.4-106-main@ab1b312 (Implementing API version 1.21.4-R0.1-SNAPSHOT)
Anyone got ideas? I highly doubt its a plugin since I haven't installed/upgraded any recently
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