After a crash occurred, Libreoffice proposes to restore open files. There are only two options : try to restore all files or cancel restoration process. In some cases it could be useful to restore only a selection of those files.
The use case is :
1. I open a file an start editing it
2. I open a second file that make Libreoffice crash
3. I launch Libreoffice and it crash during restoration process of the second file. I have no solution for restoring the first file.
Well, a crash during recovery is of course bad, and indeed leads to loss of data. But do you have a specific case and sample document that leads to this situation? Also, whether it is just one or several documents that are being recovered when the recovery crashes is hardly relevant, as data is lots in any case.
Also, even assuming the recovery succeeds for all documents that were open and modified when LO crashed, the documents are not saved aftewards, you still have to choose whether to save your modifications or not for each document.
I will close this as INVALID. Please open a separate bug if you actually have a specific reproducable case where the recovery crashes.