Log context view error "timeFieldValue.split(...)[1] is undefined" when using date_nanos

[marius-dr]

Kibana version: 7.3.0 BC4

Browser version: Firefox

Describe the bug: If you use a date_nanos field as a timefield for your index, the log context view shows the following error and it doesn't even work:

TypeError: "timeFieldValue.split(...)[1] is undefined"
    extractNanos http://localhost:5601/bundles/kibana.bundle.js:3
    _callee$ http://localhost:5601/bundles/kibana.bundle.js:3
    tryCatch http://localhost:5601/built_assets/dlls/vendors.bundle.dll.js:541
    invoke http://localhost:5601/built_assets/dlls/vendors.bundle.dll.js:541
    method http://localhost:5601/built_assets/dlls/vendors.bundle.dll.js:541
    asyncGeneratorStep http://localhost:5601/bundles/kibana.bundle.js:3
    _next http://localhost:5601/bundles/kibana.bundle.js:3
    run http://localhost:5601/built_assets/dlls/vendors.bundle.dll.js:364
    notify http://localhost:5601/built_assets/dlls/vendors.bundle.dll.js:364
    flush http://localhost:5601/built_assets/dlls/vendors.bundle.dll.js:364
 Possibly unhandled rejection: {}

Steps to reproduce:
1.Create an index with date_nanos as a field:

PUT my_index?include_type_name=true
{
  "mappings": {
    "_doc": {
      "properties": {
        "date": {
          "type": "date_nanos"
        }
      }
    }
  }
}

PUT my_index/_doc/1
{ "date": "2014-01-01" }
PUT my_index/_doc/2
{ "date": "2014-01-02" }
PUT my_index/_doc/3
{ "date": "2014-01-03" }

2. Create an index pattern using the date field as a time field.
3. Open one of the documents in Discover and select: "View Surrounding Documents"