See:
Blueberry (Vaccinium corymbosum) - Mummy Berry
Note Monilinia urnula has been reported from Idaho and Washington on black huckleberry (Vaccinium membranaceum). The disease has also been found on this host in Mount Revelstoke National Park in British Columbia. A possible new species of Monilinia was reported as associated with black huckleberry in Oregon.
Reference Hagerty, C., Gardner, S., Kroese, D.R., Yin, C., Paulitz, T.C. and Pscheidt, J.W. 2022. Occurrence of Mummy Berry Associated with Huckleberry (Vaccinium membranaceum) Caused by Monilinia spp. in Oregon. Plant Disease. 106:357-359.