Indeed I can report similar issues with \getmarking after updating to the latest version of Context. Did something change regarding its definition / use recently?

context -version
mtx-context     | ConTeXt Process Management 1.04
mtx-context     |
mtx-context     | main context file: /Users/aleks/context-osx-64/tex/texmf-context/tex/context/base/mkiv/context.mkiv
mtx-context     | current version: 2021.10.08 20:18
mtx-context     | main context file: /Users/aleks/context-osx-64/tex/texmf-context/tex/context/base/mkxl/context.mkxl
mtx-context     | current version: 2021.10.08 20:18

Alex