On 17/10/2024 1:49, Po Lu wrote:
>> Why does waiting work around the problem?
> Because it takes time for X clipboard managers to respond to selection
> ownership changes and to complete reading from other programs'
> selections.
>
> Not a bug, sorry.

Thanks for the explanation, and no need to apologise!

For those of us wanting to read more on this, I dug around a bit and 
found some explanations

here https://github.com/jhunt/xclipd,

here https://jameshunt.us/writings/x11-clipboard-management-foibles/,

and here 
https://www.uninformativ.de/blog/postings/2017-04-02/0/POSTING-en.html