Hi,
First week of January for sure.
Unfortunately I don’t think there is a temporary way around this. The pagination ‘reset’ is intentional, and is hard-coded into the plugin main script file. Turning it off manually by editing the code will not help, it will make the matter even worse, as the isotope script will malfunction, and the pagination won’t work anymore. This is basically a bypass solution for a much bigger issue. It was an accepptable solution as orientation change during a search pagination does not happen too often, at least it was not reported to be an issue until now.
The only possible solution I can see in this case is to correct the core script file, to include a detection of page number changes, and reset to the last known position if possible.