JSON Formatting no longer working

I have a List used to track maintenance jobs. Users complete an MS Form that logs details as a new item.

When a member of the maintenance team completes the job, they can add the number of hours spent on the job and some notes of what they did. I had both these columns formatted to allow inline editing.

Since an UI update, inline edits for the "Man-Hours" column do not save (the tick and cross do not appear to save/cancel edits. In line editing for "Notes" column works fine as it did before.

The JSON code for both columns are below:

Frustratingly, when trying to update any of the json code, it appears to save but when you exit and go back in, changes appear to have been discarded.

I am also having problems with a button in a column with customRowActions which updates status of the job when complete which is only partially working but I don't want to make this post more complicated and I think its all related.