Small tour groups were allowed to enter to trial how the country could cope with reopening later in stages.

The small tour groups were actually travel industry professionals. Guided groups are expected to arrive from June 10, 2022.

The program is facing a problem as one of the four Thais who were touring the Southern part of the country tested positive, and the other three were put in isolation.

Excerpt from the Kyodo News:

A test tour for inbound travelers in Japan has been canceled after one of four Thais taking part tested positive for the coronavirus, Japan’s tourism agency has said.

The traveler was in the southwestern prefecture of Oita when his or her infection was confirmed Monday. The three other participants were deemed close contacts but have all tested negative. They are currently isolating at a hotel, the agency said. The route of infection is unknown.

The tourists arrived at Fukuoka airport via Tokyo’s Haneda airport on Friday. Their itinerary included Fukuoka’s Tenjin entertainment district as well as an onsen hot spring resort in Oita. The travel company responsible for the group is providing support.

And.

On Tuesday, Chief Cabinet Secretary Hirokazu Matsuno told a press conference that the government intends to examine the response and have it reflected in the guidelines for preventing infections based on the latest case.

From June 10, Japan will allow tourism arrivals from 98 countries and regions but initially limit them to guided tours as a means to reduce the potential spread of infection.

Conclusion.

I am starting to believe that the tours are a signal to Japan's partners that the country has reopened for visitors when it has not.

Japan has temporarily canceled all visa-free travel to the country, so even the visitors on these tour groups must acquire tourist visas.

A group of people went to an onsen and an entertainment district. How would being in a small group affect the chances of these visitors getting sick in Japan?

I wouldn't travel to Japan until these requirements are removed.