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One simple and quick troubleshooting step, which was already requested, and which you did not report back on … is to log out of your regular user account. Then, create a new user account, and log in with that and test.
Same issue for the new user? -
You also have not mentioned the name of “old X11 application”.
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One other question … you’re on Leap 16 … did you run Leap 15.6 prior, and this functionality worked?
Not before it can provide everything users rely on that X11 provides, which as I understand, by design, is, and will remain, impossible for Wayland.
And, who says everyone wants a modern desktop full of whiz-bang that defies disabling, yet can’t reopen apps on the same virtual desktop, on the same display, in the same position, as when session was exited normally?
X11 has as many quirks and shortcomings. Devs from Xorg left to dev on wayland and now there’s just a handful of hopeless romantics about X11 and too many forks to make any meaningful progress. One fork incl. an author who was a roblox dev (yes I’m serious)…
That these people think they know this ancient, legacy codebase better than those who worked on it or even come close to maintaining it… Its absurd and the odds are non-existent of this ever becoming anything more than hopeless romantics.
Even the OpenBSD community is wrong about this. If they so care about security why don’t they remove X11 forwarding from openssh since their motto is secure by default? Its just romantizing legacy software at the cost of invalidating their cause.
these hopeless romantics implemented some great programs with usability in mind that is still not available in “modern” applications of that kind, as they lack respective features. (although they may have other advantages)
“modern” programmers seem to have different preferences.
having said that I would appreciate if this ideological discussion could be continued in a different thread.
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the problem neither occured in OS 15.6 nor does it occur with OS 16 on a different computer with the same program.
therefore the most likely cause for me seems to be a corrupt file or directory where the session information is stored.
but somehow nobody seems to be able or willing to share these locations.
Aside from simply asking the web search engine of your choice (which delivers surprisingly good results in AI mode if you ask a question that a human could also understand), exploring your home directory with a file browser or QDirStat or simple shell commands like find might give you insights.
The name of the application was requested, but somebody was not willing to share the name. 
the kind of meaningless relies that where to be expected.
bye
You may want to take a step back, drink a coffee, have a cookie, and read what Stefan already wrote to explain that not all apps follow the convention.
It is not possible for your helpers to recreate the issue or find the data which your arbitrary app is saving somewhere on your system if you deny to provide simple requested informations. If you do not provide the information, you need to search the missing pieces yourself. That is all.
If you don’t cooperate to find a solution to your problem that you asked about, don’t get your hopes high for others to spend their time helping you. Remember that this is a community forum where community members help other community members.
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They left the project, so I don’t know what your point is - these are not the same people. A good talk on the subject is https://youtu.be/RIctzAQOe44