[css-flexbox-1] Should 'align-content: stretch' use 'safe' in the fallback value?

Commit b6c01a41bb375777763b913006a64af87e5fa73e makes `align-content: stretch` fallback to `safe flex-start` in css-flexbox-1 https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-stretch, which is not consistent with the fallback `flex-start` specifying in css-align-3 https://drafts.csswg.org/css-align-3/#valdef-align-content-stretch.

Is this an editorial error or intentional?