Calculator Widget Issues starting with 5.1.2 release

[setuidroot]

The Simple Calculator widget has always worked just fine on my Android 7.1.2 (Lineage based ROM.) But I've noticed that the widget doesn't work correctly on Android 9 (OnePlus 6; with the last version of Oxygen OS 9 and/or with a Lineage 16/Android 9 based custom ROM.) I think it might be due to changes in Android 9? (I am not sure.)

Edit: It is not just Android 9, Simple Calculator Version 5.1.0 widget works perfectly on Android 9, the widget broke in version 5.1.2 and remains broken in the latest 5.1.3 release. I don't know how to fix it or I'd offer to help. I don't know anything when it comes to GUI stuff 🤔.

I use F-Droid releases (no 5.1.1 on F-Droid) but 5.1.1 on Github the widget works fine as well. So version 5.1.2 broke the widget somehow. I hope that helps narrow down what might have caused this.

Additionally: I updated Simple Calculator on my Lineage based Android 7.1.2 ROM (a Samsung Galaxy S5 with hack unlocked bootloader.) The latest Simple Calculator (5.1.3, from F-Droid) widget works just fine on my Android 7.1.2 phone. So I think this might be a combination of a bug introduced in the 5.1.2 calculator release that only seems to be an issue on Android 9 (and probably 10.) Unfortunately I have no other devices to test with, so that's as much info as I can gather for now.

This is best described with pictures (screenshots.)

When I first boot my phone (3 different Android 9 based OnePlus 6 phones) the calculator widget that I placed out on the screen just shows the black letters as seen (you can also see when I click the buttons, but no numbers show up.):

When I press and hold on the widget (such that the resize/remove options pop up) then the colors come back and the numbers I typed show up:

I hit divide, 2 and equals keys (to divide by 2) nothing happens until I click and hold on the widget in the same manner. Only then does the calculator widget show the numbers and operations that I typed in it.

The calculator app works just fine, but I miss the convenience of having the widget on my phone. Unfortunately I don't know why it does this and I have no idea how to fix it. I just wanted to make you aware (if you weren't already.) I appreciate your apps and how much work you put into them. I don't expect you to fix this or anything; I just wanted to let you know is all.

Thanks.

Edit: I just noticed that on my Android 7.1.2 phone I have Simple Calculator 5.1.0 (where I had 5.1.3 on all my Android 9 phones.) I downgraded my Lineage based (Android 9) Syberia OS OnePlus 6 phone to Simple Calculator 5.1.0 and now the widget is working just fine. So something broke the widget between 5.1.0 and 5.1.3... I'm not sure which release broke it, but I'll do some testing and find out.

Edit: Simple Calculator version 5.1.2 broke the widget (F-Droid builds) while 5.1.0 works perfectly. I'm changing my title to reflect the calculator version issue instead of Android 9 being the problem.