Occasionally, I have encountered a similar issue, although it is not very common. After investigating, I discovered that the problem was caused by a faulty plugin and the autohide settings on my sidebar. It might be worth checking these elements to see if they are contributing to the problem. After removing the defective extension, everything returned to its usual working order.

Based on the information provided in the change logs, am I correct to assume that Tab Islands are now a prominent feature, in addition to workspaces? If so, that would be an amazing addition to have workspaces combined with tab stacking. I have reviewed the changelog entries, however, I am unable to locate these settings in the opera://settings/ panel.