I've had a similar issue, starting last week. I use Swype + Dragon keyboard, as I have for years, but on Thursday it stopped inserting spaces automatically. It is fine for all other apps, so it is a compatibility issue between Evernote and the keyboard.
There has been another longer problem where the delete key sometimes corrupts a word, adding a letter as if the cursor was out of line when the delete occurred.
I am using a Samsung Galaxy S7 with Android 8.0.0 with Evernote 8.2 and Swype 3.2.4.
Reverting to Samsung keyboard resolves the space issue but I don't want to have to use an inferior keyboard for one app.