Nested Accordions

After recent update I noticed my nested accordions were displaying incorrectly

The nested titles were reduced to the first word of the title preceded with a ” mark and the icons were displaying the open “—” symbol while actually closed. E.g. — “Title

I had been using:

[su_accordion][su_spoiler icon="plus" title="xxxxx" style="simple"]

[_su_spoiler icon="plus" title="xxxxxx" style="simple"]
[_/su_spoiler]
[_su_spoiler icon="plus" title="xxxxxx" style="simple"]
[_/su_spoiler]

[/su_spoiler][/su_accordion]

the solution (which I don’t really understand – but works) was to change, for the nested items, _su_spoiler to su_spoiler (removing the first underscore):

[su_accordion][su_spoiler icon="plus" title="xxxxx" style="simple"]

[su_spoiler icon="plus" title="xxxxxx" style="simple"]
[_/su_spoiler]
[su_spoiler icon="plus" title="xxxxxx" style="simple"]
[_/su_spoiler]

[/su_spoiler][/su_accordion]

N.B. I had to leave the closing tag for the nested accordions as [_/su_spoiler]. That is the part I don’t understand – but it works