Joint qualifying duels known from a single draw

The Asian continent slowly is preparing to have a new set of qualifiers. Although it is not yet known how many places this continent is going to have at the next World Cup, preliminary matches for Qatar 2022 will start in the summer. Together with this, qualifying cycle begins for an future Asian Cup event as well.
Generally, qualifying games for the worldwide sport event is beginning in Asia. Undecided FIFA still thinks whether to increase number of participants at the competition, however Asian World Cup qualifiers are going to commence regardless that decision. While is still in our memory Asian Cup 2019 from this January, preliminaries for 2023 tournament are also going to kick-off.
At the headquarters of the confederation in Kuala Lumpur, Malaysia this Wednesday was drawn six duels for the preliminary round 1. Everything is going to be decided in 5 days: 06 June will be the first 90 minutes, while return legs are on 11 June. The following Asian teams who are below thirty-fourth place in the global ranking will open this campaign first and pairs are the following:

1. Mongolia - Brunei Darussalam.

2. Macau - Sri Lanka.

3. Laos - Bangladesh.

4. Malaysia - Timor-Leste.

5. Cambodia - Pakistan.

6. Bhutan - Guam.

In this whole system there is one catch: because Timor-Leste is suspended to participate at the next Asian Cup event (due to playing with players who were not supposed to appear for 2019 qualifiers), duel number 4 is valid only for the World Cup campaign. This means that Malaysia automatically entered into the second qualifying round of the Asian Cup 2023 competition.