L-form, aka protoplast or spheroplast, yeasts and fungi are likely the much more widespread and pressing issues next to biofilms. IMO of a more widespread importance than the specialty case of additional biliary survival as per this thread's original topic.
Such L-form variants (predominated by filamentous Aspergillus, plus Candida parapsilosis and others) were found in autistic children, and often their mothers yet not in healthy controls.
Acquisition of the L-forms especially during gestation and infancy is suspected to confer a particular kind of life-long immunological blindness to these.
Dysbiotic microbiota in autistic children and their mothers: persistence of fungal and bacterial wall-deficient L-form variants in blood, 2019
An according collection of case studies, albeit with a strong conflict of interests (authors are heavily involved in Mosaic Diagnostics, formerly Great Plains Laboratory, with their urine organic acid tests):
Case Study: Rapid Complete Recovery From An Autism Spectrum Disorder After Treatment of Aspergillus With The Antifungal Drugs Itraconazole And Sporanox, 2020
The seemingly most powerful antifungal combination discovered so far which targets the fungal membranes and therefore equally well any L-form persister fungi variants
is Itraconazole or Posaconazole + a HIV protease inhibitor like Atazavir (+Ritonavir as a systemic inhibitor of degradation via Cyp3A4 to boost ATV's impact. RTV can be very cheap; thus no biggie):
Enhanced antifungal activity of posaconazole against Candida auris by HIV protease inhibitors, atazanavir and saquinavir, 2024
There are a few more studies published on combinations like this without the particular use of spheroplasts but on "normal" fungi, too.
Such combos also overcome aquired resistancies by upregulated efflux pumps (CDR1/2) and the filaments and biofilm abilities. @sunsunsun