Seems like it, yes, same. It seems like this bridge-relay "relay.momostr.pink" doesn't appear in the feed at all until you go into the authors' accounts. For example, here's npubs:

@It's FOSS

@Fedora Project

Try checking this account for example (posts are published frequently):
@cosplaybot

And here's for "nostr.data.haus". These aren't all the missing npubs, just 2 examples:

@npub1ykheh...

@npub15fx0k...

But these RSS accounts don't disappear and I always see their posts in the feed:

@Все новости подряд (RSS Feed)

@Phoronix (RSS Feed)

Try subscribing, then restart the app. If you go into the accounts or adjust something in the relay settings, all posts may temporarily appear. But if you close the app and launch it later, many posts will disappear from the feed again. I'm clarifying once more: the issue is only in the feed. I can see all posts if I personally visit the authors' accounts.