Last month, Flesh and Blood's Monarch (see "TCGplayer Top 25 Sealed TCG Products (With Price Shifts) - May 2021") topped the charts while Magic's Modern Horizons 2 and Pokemon's Chilling Reign were still in the preorder cycle. Upon their respective releases in June, both sets sold incredibly well. Modern Horizons 2 sold so well that four of its products managed to grab spots on the top 10 slots of the chart (see "TCGplayer Top 25 Sealed TCG Products (With Price Shifts) - June 2021").
This trend can be likely be partially attributed to the return of in-store organized play, as the product that captured the #8 slot was the Modern Horizons 2 Prerelease Pack. This product type had been a bit of a laggard on the sealed charts since OP went down due to the COVID-19 pandemic (see "Wizards of the Coast Temporarily Suspends 'Magic: The Gathering' In-Store Play in U.S. and Latin America"). At-home prereleases kept sales steady, but they were no substitute for sales power of in-person events that returned in to the U.S. in May (see "U.S. In-Store Play Suspension for 'Magic: The Gathering' Will End Soon").
Also of note, on the Magic sealed front, are the positions of the Adventures in the Forgotten Realms on the chart during preorder. The Draft Booster Box is at #18 and the Collector Booster Display is at #22, which is a little low on the chart for a Magic product on preorder a month before release. The lower rank is likely due to strong sales for other TCG sealed product, which consumed higher slots on the chart, as well as lack of significant card spoilers for the set. Spoilers for the set started trickling out in late June (see "Mark Rosewater Teases Cards in Upcoming 'D&D' 'Magic: The Gathering' Set"), which may have been too late to make an impact on the June chart.Pokemon TCG and Yu-Gi-Oh! TCG carved up the majority of the slots on the rest of the chart. Unsurprisingly, Chilling Reign Booster Box claimed the #1 slot, as Pokemon is still the hottest TCG. Flesh and Blood, Digimon, and Dragon Ball Super all hung onto one slot each on the chart after their respective major Q2 releases.