preview, check out https://explorer.e.cash/address/ecash:qzppgpav9xfls6zzyuqy7syxpqhnlqqa5u68m4qw6l to see txs with the same blockheight getting slightly different timestamps
{F8562812}
can check out http://localhost:3035/address/ecash:qzuec4eff39mzjwh9gcqxee4qjfy5ns0wqlth2k995?page=2 (random address I found by looking up block 500,000 to get txs this node would not have timeFirstSeen for) to see txs with same blockheight get the same timestamp when timeFirstSeen is 0
{F8562809}