calibredb.exe export template question

[phossler]

Win 10, 64 bit

calibredb

https://manual.calibre-ebook.com/template_lang.html

export --progress --all --dont-save-cover --dont-write-opf --format kfx
--single-dir
--template "{authors}-{series}{series_index:0>2s|[|]-}{title}"
--to-dir "D:\eBooks\KFX"

Running this as in a batch file, the file names are correct on disc and when sideloaded to my Paperwhite

e.g. Tom Clancy-Jack_Ryan[03]-Hunt for Red October, The.kfx

but the Kindle Home page sees a space before the series suffix bracket in the title

e.g. Jack_Ryan[03 ]-Hunt for Red October

I had this issue when I was converting to AZW3, but using the KFX plug in, I noticed that something (kfxgen??) was inserting the space in the title of the output file (attached)

Is there a workaround? I tried changing the template, but no joy

Thanks