In the Outliner Software forums, user Lucas suggested another tweak (found in this thread on the Obsidian forums):
it may also be advisable to tweak how Logseq handles note titles. Logseq can be configured to get note titles either from file names or from titles at the top of notes. If you want to be able to create notes from within Obsidian and have Logseq read them properly, then it’s generally best to tell Logseq to get note titles from file names. This can be done by adding the following text to the file logseq/config.edn:
:page-name-order "file"