Certain saved text in the Plutarch Editor disappearing on reload

Description

When working on a general article, the square brackets around this text keeps disappearing upon reloading the page, even when saved.

'[Architect] '*Static* -eep Void-Chronomancy takes -*Deep raged breath* - a lot out of me.'

[GBE] 'You're sure it will work?'

[Architect] 'Yes, it should - breath -should be in place now.'

[GBE] 'Thanks, father.'

In the following text:

[angular Caretaker text]

[Beneath] 'Ramiel, you rockhead, she said 3 times. Go down and ask her yourself if you don't believe me'

[Beneath] 'It would appear you are right. Sorry, Pyet'

'[angular Caretaker script]' becomes 'script', and the square brackets around 'Beneath' disappear.

The square brakets around later text such as:

[GDD | 1] 'Hey, did we consider that failsafe you put into this place? If we go ahead with this, you won't be warned.'

do not disappear on reload.

Interestingly, this effect appears to carry over to copying the text, with the pasted text here also not having square brackets.

I have not been able to reproduce this myself, though it is consistent every time when I rewrite the text and then reload again.