I think this is the fix

StanleyGoldman · StanleyGoldman · commit a239db038c1d · 2018-11-05T10:40:38.000-05:00
diff --git a/src/BCC.Web/Services/GitHub/GitHubAppModelService.cs b/src/BCC.Web/Services/GitHub/GitHubAppModelService.cs
@@ -152,6 +152,8 @@ public async Task UpdateCheckRunAsync(long checkRunId, string owner, string repo
                 {
                     Output = new NewCheckRunOutput(createCheckRun.Title, createCheckRun.Summary)
                     {
+                        Text = createCheckRun.Text,
+                        Images = createCheckRun.Images?.Select(image => new NewCheckRunImage(image.Alt, image.ImageUrl) { Caption = image.Caption }).ToArray(),
                         Annotations = annotations
                             .Select(CreateNewCheckRunAnnotation)
                             .ToArray()

Original file line number	Diff line number	Diff line change
`@@ -152,6 +152,8 @@ public async Task UpdateCheckRunAsync(long checkRunId, string owner, string repo`
`152`	`152`	`{`
`153`	`153`	`Output = new NewCheckRunOutput(createCheckRun.Title, createCheckRun.Summary)`
`154`	`154`	`{`
	`155`	`+ Text = createCheckRun.Text,`
	`156`	`+ Images = createCheckRun.Images?.Select(image => new NewCheckRunImage(image.Alt, image.ImageUrl) { Caption = image.Caption }).ToArray(),`
`155`	`157`	`Annotations = annotations`
`156`	`158`	`.Select(CreateNewCheckRunAnnotation)`
`157`	`159`	`.ToArray()`