Perhaps the glass dish changed the timing? More likely it was just one of those flats that don't turn out right.
Sounds like you have the perfect first step for some brisket chili.
I hope that Brother Donnie sees this and chimes in.
Jim - Another transplanted Texan
Former KCBS CBJ
Large and Medium Big Green Eggs , Black 18.5" WSM, Blue Weber Performer - Stainless, Green Weber OTG Kettle , Brinkmann SnP Pro, and a Stainless UDS. One retired Portable Kitchen grill.
Red Thermapen, Maverick ET-73, EdgePro Apex Sharpener.
Avatar is the original 1951 Weber Kettle