I am having the strangest sense of déjà vu, I could swear someone had a very similar issue recently in the community but for the life of me I cannot come across the post or my reply. 
I know I have come across some similar issues where my email client (Gmail) does not always show every single email in your inbox.
I cannot tell you a rhyme or reason for it, but I have previously had moments when searching for an email I know to be expecting, even searching directly with a keyword or subject name, i.e such as “Bitwarden”. Checking the All Mail option didn’t show, thinking perhaps it was caught in Spam or elsewhere but alas I cannot find an email I know should have been received.
Oddly enough if you know the sender email searching via the email address would always show the missing email. Again I cannot seem to explain the reasoning as there are no other forwarding rules etc that may be in place, but appears to be Google’s “infinite wisdom” to filter content that you may not interact with typically and is deemed somehow less relevant or important.
Perhaps something similar is happening in your case, I would try to search directly for emails coming from the sender address [email protected] and hopefully that may show your missing emails.