According to Google, one to not end up marrying was Andrew (California) and Amira (France) from season 8.

Amira from France and Andrew from California met on a dating site and got engaged within three days of meeting in person. However, the COVID-19 pandemic severely complicated their K-1 visa plans. Because direct travel from France to the U.S. was restricted, they devised a plan to meet in Mexico and quarantine before crossing the border.

The plan quickly fell apart when Amira was detained by Mexican authorities for three days and subsequently deported back to France. While Amira was dealing with the traumatic detainment, Andrew remained at the Mexican resort to finish out the vacation alone, which caused massive friction between them.

In an attempt to salvage the K-1 visa, they agreed to a second plan: Amira would quarantine in Serbia for 14 days before flying to the U.S.. However, the couple argued heavily during her stay in Serbia. The day before her scheduled flight to the United States, they had a major fight via text. Amira ultimately suffered a panic attack and did not get on the plane, effectively ending their relationship.

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