"paymentIntentID not found" on contribution page
I'm 98% but not 100% certain this is the same as #219 (closed). It looks similar, but I don't have the "PropertyBag deprecated warnings". Below is from my logs. This is Stripe 6.5.1, Payment Shared 0.9.4, CiviCRM 5.29.1.
Like #219 (closed), it shows up as "Pending (Incomplete Transaction)" in Civi, and there's no record of it in Stripe. It differs from #106 (closed) in that this happened on a public contribution page.
I have 4 contributions like this out of several dozen in the past several days. This one is "on behalf of organization" but that's a red herring; the other three are not.
Oct 10 20:51:51 [debug] paymentIntentID not found. $params: Civi\Payment\PropertyBag Object ( [props:protected] => Array ( [default] => Array ( [qfKey] => cefbf1bfdf51bad5405d82eed974a5e4fc5b50d1c88a3a70d535fe81d4793918_6213 [entryURL] => https://crm.agbu.org/civicrm/contribute/transact?reset=1&id=44 [prefix_id] => 1 <snip personal info> [is_for_organization] => 1 [onbehalf] => Array ( <snip personal info> ) [hidden_processor] => 1 <snip personal info> [priceSetId] => 48 [price_99] => 0 [price_100] => 600 [MAX_FILE_SIZE] => 67108864 [timestamp] => 1602376426 [ip_address] => <snip> [amount] => 600 [currency] => USD [is_pay_later] => 0 [organization_name] => <snip> [onbehalf_location] => Array ( <snip> ) [invoiceID] => a1ac4faa3f4fab84fddd8867626189fc [is_quick_config] => 1 <snip> [preserveDBName] => 1 [onbehalf_contact_id] => 136150 [skipLineItem] => 0 [line_item] => Array (  => Array (  => Array ( [price_field_id] => 100 [price_field_value_id] => 429 [label] => Other Amount [field_title] => Other Amount [description] => [qty] => 1 [unit_price] => 600 [line_total] => 600 [participant_count] => 0 [max_value] => [membership_type_id] => [membership_num_terms] => [auto_renew] => [html_type] => Text [financial_type_id] => 1603 [tax_amount] => 0 [non_deductible_amount] => 0.00 ) ) ) [contributionTypeID] => 1603 [financialTypeID] => 1603 [financial_type_id] => 1603 [contributionType_name] => <snip> [financialType_name] => <snip> [contributionType_accounting_code] => 4001 [financialType_accounting_code] => 4001 [contributionPageID] => 44 [contactID] => 134253 [payment_instrument_id] => 41 [item_name] => <snip> [contributionID] => 174239 [isRecur] => [error_url] => /civicrm/contribute/transact?reset=1&id=44&_qf_Main_display=1&qfKey=cefbf1bfdf51bad5405d82eed974a5e4fc5b50d1c88a3a70d535fe81d4793918_6213 [paymentIntentID] => ) ) [suppressLegacyWarnings:protected] => [lastWarning] => )