Problem with Facebook messenger

I have Iphone SE, with ios version 11.
I am blind, and I use Voice over screen reader.
I have a problem with Facebook messenger, version 135.0, which is the last version.
1. Open Messenger, and create new message with a contact friend.
2. During I write the message, I accept an incoming call.
3. After I end the call, I return on messenger and I want to continue my message.
4. but if I re open the contact friend, messenger close.
6. I reopen messenger.
7. I find the contact friend which I write the message.
7. If I open the diskusson, messenger close again.
I solved this problem with the folloing steps:
1. I open messenger.
2. Find the contact friend, but before I open it, close Voice over.
3. Open the contact friend.
4. Activate Voice over.
5. Delete the old text.
6. After this, Messenger works propperlly.