overflow-x: clip; will also apply clipping on the Y-axis.
The correct implementation of this should only affect the X-axis. This is correctly implemented in all browsers except for Safari
overflow-x: clip; Is implemented incorrectly in Safari
I believe this issue is fixed in recent OS versions. What OS version are you testing with, and does the issue reproduce in Safari Technology Preview?
If you can reproduce the issue, please supply a small example or the URL for a page where this issue can be reproduced.