[Sugarcube] Quotation marks, or 'Speech marks'/Apostrophes not showing In Passage links

Here's something that's been on my mind for a while, but has more recently come forward as a more.. Threatening issue.

I have just done a test to confirm the validity of this error:

[['Quotation mark test']]

[['Quotation mark test'|Quotation mark test 2]]

[['Quotation mark test'|'Quotation mark test 3']]

Will display in passage as:

'Quotation mark test'

Quotation mark test

Quotation mark test

Even though they all have quotation marks/apostrophes in the text, the only one that will show is the first iteration.

I had noticed this problem before but had assumed it was an error on my part. Now, I can't be so sure.. Why does this error persist?