Hello there, you can try one more thing if you wish.
Go to themes and activate the designer mode.
After that just follow the steps from the image I left down below.
1.
2. Wait until the designer mode was builded on all of your templates.
3.
4. After that, when you are done, press on this button again and follow the last steps from the image that I left you down below.
Now, maybe this isn't the right way to do it, but when ever I had a problem like that, I just did this what I showed you in the images and everything worked again (90.99% sure) 😄 😛