Activities not Syncing

Bug description: Doing a Sync or Full Sync is not fetching recent activities. Actual Behavior: After a manual sync or full sync, 5 recent cycling activities are not included on the multisports fitness trend (MSFT). Expected Behavior: After a manual or full sync, every recorded activity is included on the MSFT. Steps to Reproduce: Open MSFT with link from main strava dashboard.

Click "Synced minutes ago". Sync runs in new window. OR Click the History icon and Select "Redo Full sync". Sync runs in new window. Chrome version Version 61.0.3163.100 (Official Build) (64-bit) Plugin version: 5.11.1 Stable Activities links?: https://www.strava.com/activities/1235274334 https://www.strava.com/activities/1235889876 https://www.strava.com/activities/1238304643 https://www.strava.com/activities/1240939498 https://www.strava.com/activities/1240939536

Console errors? (press F12 to see developer console, and copy paste here):

Uncaught TypeError: Failed to execute 'unobserve' on 'IntersectionObserver': parameter 1 is not of type 'Element'. at e.handleDomElementRemoved (manifest-0e2e11b982fd248afaa86ab56979f794.js:77) at Mb.j (core,mediarss,geo,opensearch,atom,threading,app,gdata,finance,contacts,analytics,blogger,maps,gbase,acl,calendar,default.I.js:8) at e.walkNodeTree (manifest-0e2e11b982fd248afaa86ab56979f794.js:77) at e.Mb.j [as walkNodeTree] (core,mediarss,geo,opensearch,atom,threading,app,gdata,finance,contacts,analytics,blogger,maps,gbase,acl,calendar,default.I.js:8) at e.walkNodeTree (manifest-0e2e11b982fd248afaa86ab56979f794.js:77) at e.Mb.j [as walkNodeTree] (core,mediarss,geo,opensearch,atom,threading,app,gdata,finance,contacts,analytics,blogger,maps,gbase,acl,calendar,default.I.js:8) at e.walkNodeTree (manifest-0e2e11b982fd248afaa86ab56979f794.js:77) at e.Mb.j [as walkNodeTree] (core,mediarss,geo,opensearch,atom,threading,app,gdata,finance,contacts,analytics,blogger,maps,gbase,acl,calendar,default.I.js:8) at e.walkNodeTree (manifest-0e2e11b982fd248afaa86ab56979f794.js:77) at e.Mb.j [as walkNodeTree] (core,mediarss,geo,opensearch,atom,threading,app,gdata,finance,contacts,analytics,blogger,maps,gbase,acl,calendar,default.I.js:8)

Link screenshots or youtube video link if necessary:

该提问来源于开源项目：thomaschampagne/elevate