I have two layers in a web map where I have created a two-tier symbology style that is working perfectly in ArcGIS Online, but when I view that map in Field Maps (both the online and offline maps), the symbology only shows the first tier. I made a first rendition of this web map a couple of months ago with this symbology and it showed up perfectly in ArcGIS Online AND Field Maps (online and offline), but when I made the second rendition of this map, my symbology for these two layers got wiped out and so I had to rebuild the symbology (which wasn't an issue), and it shows up how I want it to in ArcGIS Online just like the first edition of the map, but won't show up in Field Maps. I even had my coworkers check their online map on their Field Maps app and they can't see the two-tier symbology either, just the first tier.
More specifically, these two layers are part of a survey my company has to do, so the symbology I am using is unique symbols on a text field to show what features are a part of the survey, and then using the Transparency by Attribute on a date field to set it so that features with a date will show up transparent, indicating that the survey has been completed for that feature. I am using this symbology set up for both a line and point feature. The transparency portion of the symbology is the part that is not showing up in Field Maps anymore; the unique symbols for both layers are working.